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SD-PX15H
8 – 16
IC3704 VHiAN8785SB-1: Focus/Tracking/Spin/Sled Driver (AN8785SB)
In this unit, the terminal with asterisk mark (*) is (open) terminal which is not connected to the outside.
Pin No.
Terminal Name
Input/Output
Function
1
FCSN
Output
Driver 1 inversion output terminal.
2
TRK_IN
Input
Driver 5 input terminal.
3*
OP_OUT
Output
OP amplifier output terminal.
4*
OP_N
Input
OP amplifier inversion input terminal.
5*
OP_P
Input
OP normal rotation input terminal.
6
VREF
Input
VREF input terminal.
7
2.5V_OUT
Input/Output
Driver 2 normal rotation input terminal (2.5 V output terminal).
8
REFSEL
Input
Driver 4 normal rotation input switch terminal.
9*
LOAD_IN
Input
Driver 2 input terminal.
10
PVCC2
Input
Driver power supply terminal 2.
11*
LOADP
Output
Driver 2 normal rotation output terminal.
12*
LOADN
Output
Driver 2 inversion output terminal.
13
SPINP
Output
Driver 3 normal rotation output terminal.
14
SPINN
Output
Driver 3 inversion output terminal.
15
PGND2
—
Driver ground terminal 2.
16
NMUTE
Input
Stand-by input terminal.
17
SLDP
Output
Driver 4 normal rotation output terminal.
18
SLDN
Output
Driver 4 inversion output terminal.
19
PVCC3
Input
Driver power supply terminal 3.
20
SPIN_IN
Input
Driver 3 input terminal.
21
SLD_IN
Input
Driver 4 input terminal.
22
SVCC
Input
Power supply terminal.
23
FCS_IN
Input
Driver 1 input terminal.
24
PVCC1
Input
Driver power supply terminal 1.
25
TRKP
Output
Driver 5 normal rotation output terminal.
26
TRKN
Output
Driver 5 inversion output terminal.
27
PGND
—
Driver ground terminal 1.
28
FCSP
Output
Driver 1 normal rotation output terminal.
16
10
12
11
18
17
14
13
19
1
28
26
25
24
7
9
8
21
15
20
23
27
2
22
6
3
5
4
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
Standby
Standby
D2-
D2+
D4-
D4+
D3-
D3+
D1-
D1+
D5-
IN-
IN+
OUT
IN5
PGnd1
IN1
IN3
switch
1.25V
PGnd2
IN4
Ch.4 SW
IN2-
IN2+
SGnd-Fin
SV
CC
V
REF
D5+
Protection
Circuit
Circuit
Band-gap
V
CC
/V
REF
Reset Circuit
PV
CC3
PV
CC1
PV
CC2
Figure 8-16 BLOCK DIAGRAM OF IC
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